79645157 has 2 divisors, whose sum is σ = 79645158. Its totient is φ = 79645156.

The previous prime is 79645141. The next prime is 79645171. The reversal of 79645157 is 75154697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 185761 = 8914^2 + 431^2 .

It is an emirp because it is prime and its reverse (75154697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79645157 - 2⁴ = 79645141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79644157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39822578 + 39822579.

It is an arithmetic number, because the mean of its divisors is an integer number (39822579).

Almost surely, 2^79645157 is an apocalyptic number.

It is an amenable number.

79645157 is a deficient number, since it is larger than the sum of its proper divisors (1).

79645157 is an equidigital number, since it uses as much as digits as its factorization.

79645157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 44.

The square root of 79645157 is about 8924.4135381548. The cubic root of 79645157 is about 430.2489220360.

The spelling of 79645157 in words is "seventy-nine million, six hundred forty-five thousand, one hundred fifty-seven".